64. Here the disbelievers’ question cited in (verse 48) above, is being answered by reason and argument. The question: When will the threat of Resurrection be carried out? had not been asked with a view to find out the exact date of the coming of the Hereafter. But they asked it because they thought it was impossible, rather irrational, that human beings would be raised back to life after death. That is why, in reply to their question, arguments are being given for the possibility of the Hereafter. According to the traditions related by Ibn Abbas, Qatadah and Said bin Jubair, one of the chiefs of Makkah, on this occasion, came up with a rotten bone of a dead person, from the graveyard. He broke and crushed it into pieces before the Prophet (peace be upon him) and scattering its particles in the air, said: O Muhammad, you say that the dead will be raised back to life. Tell us who will give life to these decayed and rotten bones? The answer was given immediately in the form of these verses.
65. That is, We caused the sperm-drop which contained nothing but the basic germ of life to develop to an extent that it started moving and eating like the animals. Furthermore, it has developed such powers of intellect and reasoning and disputation and speech, which are not possessed by any animal; so much so that now he dares stand up as an adversary before his Creator!
66. That is, he regards Us powerless and weak like the creation, and thinks that just as man cannot raise the dead back to life, so also can’t We.
67. “Forgets his own creation”: Forgets that We created the basic germ of life from dead matter, which became the means of his creation; then We caused the germ to develop to such an extent that now he stands before Us as a disputant.